Crank-pin-turning machine.



J.- PURGELL. CRANK PIN TURNING MACHINE. v APPLICATION FILED AUG. 31,1910.

Patented Apr. 22, 1913.

7 SHEETS-SHEET 1.

Ll L J COLUMBIA. PLANDGRAPH CO.,WASHINGTON. D. c.

V J. PURGELL. CRANK PIN TURNING MACHINE.

APPLICATION FILED AUG. 31, 1910.

Patented Apr. 22, 1913.

7 SHEETS-SHEET 2.

.I. PURGELL. GRANK PIN TURNING MACHINE.

APPLICATION FILED AUG. 31, 1910.

1,059,635. Patented Apr.22, 1913.

7 SHBETS-SHEET 3.

COLUMBIA PLANOGRAPH c0.,wAsHlNuTON. B c:

J. PURCELL.

CRANK PIN TURNING MACHINE.

APPLICATION FILED AUG. 31, 1910.

1,059,635. Patented Apr. 22, 1913.

7 SHEETS-SHEET 4.

- COLUMBIA PLANOLIRAPH 60-, WASHINGTON, D- C.

J. PURCELL.

CRANK PIN TURNING MACHINE.

APPLICATION FILED AUG. 31, 1910.

1,059,635. Patented Apr. 22, 1913.

7 SHEBTSSHEET 5.

I lW/cneoflo vg wumto'a W 9?) 314301442 I r h COLUMBIA PLAY 40GRAPH C0,,WASHINGTON, D c

J. PUROBLL.

Patented Apr. 22, 1913.

7 SHEETB-SHEET 6.

CRANK PIN TURNING MACHINE.

APPLICATION FILED AUG. 31, 1910.

JIIHIWI COLUMBIA PLANOGRAPH cu.,WASHlNl;TON, D- c.

J. vPUROELL. CRANK PIN TURNING MACHINE.

APPLICATION TILED AUG.31, 1910.

Patented Apr. 22, 1913 7 SHEETE-BHEET 7.

COLUMBIA PLANOORAPH c0..w HlNuTQN. D; c.

JOHN PURCELL, OF TOPEKA, KANSAS.

CRANK-PIN-TURNING MACHINE.

To all whom it may concern Be it known that I, JOHN PURcELL, of Topeka,1n the county of Shawnee, and in the State of Kansas, have invented acertain new and useful Improvement in Crank-Pin- Turning Machines, anddo hereby declare that the following is a full, clear, and exactdescription thereof.

The object of my invention has been to provide a portable machine forturning crank pins which shall have among other advantages that of beinglight, and yet being capable of doing accurate work and being put intooperative position without being taken apart, and to such ends myinvention consists in the portable crank-pin turning machine,hereinafter specified.

Specifically, my invention relates to a machine for turning a crank-pinprojecting from the face of a wheel or crank arm so that it has one endfree. I

My invention is capable of embodiment in many different forms.

I have chosen for illustration that form which I regard as the best.form known to me, but it is to be regarded as typical, only, of the manypossible embodiments, and I am not to be limited to its specificdetails.

Figure 1 is a side elevation of a portable crank pin turning machineembodying my invention; Fig. 2 is a right-hand end elevation of Fig. 1;Fig. 3 is a lefthand end elevation of Fig. 1; Fig. 4 is a sect-ion onthe line 44 of Fig. 2; Figs. 5, 6 and 7 are sections on the lines 5-5,6-6 and 7 7 of Fig. 4, respectively; and Fig. 8 is a section on the line8-8 of Fig. 7.

In a general way the illustrated embodiment of my machine consists of ahat shaped frame which is adapted to be put over the crank pin to beturned, as a hat is put over a head, and the frame preferably has aflange, like a hat brim, by which it is adapted to be secured to thewheel or crank from which the pin projects. Within the hat-shape frame,a cylindrical frame revolves about the crank pin and carries one or moretools, the tools being mounted on guide ways on which they are caused totravel parallel to the axis of the pin, so as to turn a spiral cuttingoff the pin. In order to utilize the strength of the crank pin so as toenable the frame to be made as light as possible, I support the outerend of the frame on the end of the crank pin.

In the accompanying drawings, what I Specification of Letters Patent.

Application filed August 31, 1910.

Patented Apr. 22, 1.913. Serial No. 579,933.

have termed the hat-shaped frame comprises, first, the base plate 10which is annular, and is provided with slotted ears 10 by which it maybe bolted to the machined hub of the wheel or crank. The said plate isalso provided with a centering device to be later described. IV hatcorresponds to the cylindrical portion of the hat-shaped frame is aframe or cage consisting of rings 11 and 12, respectively, which areconnected by bars 13, preferably 3 in number, extending parallel to theaxis of the cylinder and cast in one piece with the said rings.

The inner, revolving tool-carrying frame consists of two annular gears14 and 14 re spectively, which are bolted to and connected by bars 15that form guides for the tool carriages, later described. The said gearsare provided with shoulders 14 and 14, respectively, forming journalsfor the gears, which journals bear in bushings 16 and 17 that arerespectively seated in the plate 10 and in a ring 18, the latter beingbolted to the ring 12. A recess is formed between the plate 10 and thering 11 for the gear 13 and a similar recess is formed between the ring12 and the ring 18 for the gear 14, so that the said gears are providedwith good bearings and are prevented in every direction from play.

The gears 14 and 14 are driven by pinions 19 and 20, respectively, whichare fast on a driving shaft 21 that is mounted in bearings formed in theframe of the machine. By thus driving both ends of the tool-carryingcage, I prevent any springing or torsion of such frame and insure asteady, perfect drive. I am, moreover, enabled to make such frame muchlighter than would otherwise be possible. The driving shaft may beturned by hand or power. For the former purpose, I extend it beyond theframe so that a crank may be attached thereto. In order to pro vide forgearing for turning the driving shaft by power, I preferably cast a lug22 on themain frame to form part of and support a gear case. Within suchcase a gear 23 is keyed on thedriving shaft, and an idler 24 (mounted ona pin supported by said gear case) drives the said gear. A motor pinion25 is keyed on the motor shaft 26 which is journaled in the gear case.The free end of the motor shaft is preferably tapered so as to bereadily attached to the usual portable pneumatic or electric motor 27.

Referring now to the manner of mounting and driving the tools: The bars15 of the inner, revolving cage have dovetailed guides formed on theirsides facing in the direction of rotation, and on each of such guides ismounted a main tool slide 28, the usual gibs and tightening screws beingprovided. Each bar 15 is provided with a lead or feed screw 20 connectedto its tool slide in the usual manner and by which the tool slide ismoved. Each tool slide has formed on its face a dove-tailed guide 30 atright angles to its bar 15, the faces of the guides 30 thus extendingtransverse to the axis of rotation of the tool carriage. On each guide30 is mounted a cross-feed block 31, and a cross feed screw 32 isjournalecl in the tool slide and engages the cross-feed block so thatthe latter may be adjusted for the depth of the cut. These screws arepreferably adjusted by hand. The slots 33 are formed in the cross-feedblocks to receive the bases of the tool-posts 34 in the usual manner,the usual concave rings 35 and rocker-pieces 36 being provided.

The main feed-screws 29 are automatically driven in the followingmanner: They are extended through and beyond the ring 18 and there haveattached thereon star-wheels 37 and 38, respectively. A ring or coverplate 39 is bolted to the ring 18 over and outside of the star-wheels.In order to turn the star-wheels, certain stoppins 41 are mounted in thecover plate. Each stop-pin comprises a pin, proper, 42 having a knurledhead 43. The pin 42 is mounted in a bushing 44 that is threaded into thecover plate. The pin 42 is provided with a shoulder 45 against whichbears a spring 46, the spring being held down against the shoulder by acap or sleeve 47 that is screwed into the upper end of the bushing. Thepin 42 carries a lug 48 and the cap 47 has a slot formed therein throughwhich the said lug is adapted to pass. Thus by turning the lug 48 intoline with the slot, the stop pin can be forced down against the stressof the spring and thus put into position to engage the teeth of a starwheel as it passes, or by turning the lug into line with the slot andpermitting the spring to throw the stop pin outward until the lug haspassed through and above the slot, the stop pin can be raised out of thepath of the star wheel teeth and thus rendered inoperative.

I wish to render the star wheels independently operable so that thetools can be used for instance, to turn crank-pins having two bearingsof different diameters to accommodate two separate connecting rods, onetool turning one bearing while the other tool turns the other bearing,and both tools working in either direction. To accomplish this, I makeone star wheel, as 37,

larger and at a lower level than the other star wheel as 38, but theaxes of such wheels are preferably at the same radial distances from themain axis of the machine. By the term lower level, I mean a greaterdistance from the pin-supporting ring 39. I then provide a series ofstops 49, which are at such a radial distance and which have such lengththat when forced downward, they stand in the path of those teeth of thelarger wheel 37 which project toward the center. I also provide a seriesof stops 5O placed at such radial distance and of such a length whenforced in, that they may stand in the path of the teeth of the largerstar-wheel when those teeth project outwardly. These series of steps 49and 50 are respectively too near the center and too far from the centerto engage the teeth of the smaller star-wheel. WVhen one series is used,the larger wheel turns to the right and when the other series is used,it turns to the left. The speed of turning depends on the number ofstops in action in a series. In order to prevent the breakage that wouldresult if the wheel contacted with stops on both sides of the center atthe same time, I stagger the stops of the two series and thus, ifinadvertently stops of both series be thrown into action, the onlyresult would be to turn the star wheel alternately in one direction andthe other. Similarly to the larger star wheel, the smaller star wheel 38is provided with an inner and an outer set of stops 51 and 52,respectively, and these stops are only long enough to engage the teethof the small star wheel and do not extend far enough to touch the largerstar. wheel.

By the described arrangement it is possible to cause either star wheelto operate independently of the other and to cause either one to rotatein either direction.

I support my machine on the outer end of the crank pin, and theparticular manner in which I carry out my idea is to provide across-brace 53 which is provided with dovetailed slots 53 that areadapted to receive and engage the dove tails on the bars 15 of therevolving cage, the arms of the crossbrace being clamped on the dovetails by the bearing of screws 54 (threaded into such arms) on plates orgibs seated in slots in the said arms. A centering screw 56 is threadedinto the cross-brace and is provided with a lock nut 57. The cross-bracecan thus be slid along the bars until the centering screw is near thecenter in the crank pin end, and then. the brace can be secured to thebars, and the screw can be screwed home and locked by the nut. I alsoprovide a centering device to engage the center in the shaft crank orwheel-hub. In formlng this latter device in the illustrated form of myinvention I provide the base plate 10' with an arm 58 which has a slotformed therein in which is mounted a male block 59 having a base thatfits the under side of the arm 58 and the slot therein and having a postor sleeve that extends through the slot and has the centering screw 60threaded therein. The latter is provided with a lock nut 61. A femaleblock 61 fits over the post of the block 60 bears on the upper side ofthe arm 58 and fits the slot therein. A nut 62 is threaded on the postand serves to clamp the blocks against the opposite sides of the arm. Atapered pin 63 is mounted in a hole or holes formed in one or both ofthe said blocks and engages any one of a series of holes formed in thearm at definite distances from the axis of the machine (or from thecentering screw 56) and thus the throw of the crank to be turned can beaccurately fixed by engagement of the pin 63 with the proper hole in thearm.

In the operation of my machine, as above illustrated, to turn the crankpin of a locomotive or stationary engine, the machine is placed over thefree end of the crank pin, the latter entering the machine through theopening in the base plate and through the hole in the lower annular gearof the re volving cage. The cross-brace is either free to slide on thebars 15 or it is withdrawn so that its centering screw is out of contactwith the crank. Bolts are then passed through the arm 10 and the baseplate loosely clamped against the machined face of the crank boss ordisk. The machine is then shifted until the centering screw 60 (whichhas previously set to agree with the desired throw of the crank) is madeto enter perfectly into the center of the crank or axle. The machine isthen further shifted until the centering screw in the cross brace ismade to enter into the center in the outboard end of the crank pin, whenthe machine is finally and firmly clamped to the crank boss or disk. Thecutters are then set at the proper radial distance for the depth of cutdesired, the proper stops are put into position to engage the starwheels and the driving shaft being rotated, the cage is revolved and thecutters turn the pin.

It will be observed that I have provided a comparatively simple machinewhich can be made so light as to be readily portable and yet which is sosustained by the crank and crank pin on which it is operating as to beexceedingly rigid and thus capable of doing accurate and heavy work. Itwill also be observed that my machine is capable of automaticallyfeeding the cutters both for ward and backward along the crank pin sothat there need be no time-consuming idle back stroke of the cutters,and that it is capable of turning two independent bearing surfaces atthe same time. My machine can be placed in position for work and removedtherefrom without disassembling any of its parts.

It is obvious various changes can be made in the above illustratedembodiment of my invention which will be within the scope of myinvention and I desire not to be limited beyond the requirements of theprior art and the necessary intendment of my claims.

I claim:

1. In a machine for turning crank pins; the combination of a stationaryouter cage, an inner cage journaled in said outer cage, said cageshaving concentric openings adapted to receive a crank pin, means forsupporting said frame on the free end of a crank pin, gears, one at eachend of said inner cage, a shaft journaled on said outer cage, pinionsmounted on said shaft and meshing with said gears and a cutter mountedon said inner cage.

2. In a machine for turning crank pins, the combination of a rotatabletool carrier, a plurality of tool slides mounted on said carrier, feedscrews for each of said slides, a star wheel mounted on each of saidfeed screws, one of said star wheels being larger than the other andfarther from the hereinafter mentioned stop support, a stop support andseparate stops for rotating each of said wheels, the stops for thelarger wheel being farther fro-m the path of travel of the axes of saidwheels, the stops of the smaller wheel not extending to the plane of thelarger wheel.

3. In a machine for turning crank pins, the combination of a rotatabletool carrier, a plurality of tool slides mounted on said carrier, feedscrews for each of said slides, a star wheel mount-ed on each of saidfeed screws, one of said star wheels being larger than the other andfarther from the hereinafter mentioned stop support, a stop support andseparate stops for rotating each of said wheels, the stops for thelarger wheel being farther from the pat-h of travel of the axes of saidwheels, the stops of the smaller wheel not extending to the plane of thelarger wheel, each of said wheels having two sets of stops, one for eachside thereof.

I. In a machine for turning crank pins, the combination of a rotatabletool carrier, a plurality of tool slides mounted on said carrier, feedscrews for each of said slides, a star wheel mounted on each of saidfeed screws, one of said star wheels being larger than the other andfarther from the hereinafter mentioned stop support, a stop support andseparate stops for rotating each of said wheels, the stops for thelarger wheel being farther fro-m the path of travel of the axes of saidwheels, the stops of the smaller wheel not extending to the plane of thelarger wheel, each of said wheels having two sets of stops, one for eachside thereof, the stops for the sets of each wheel being staggered.

5. In a machine for turning crank pins, the combination of a rotatabletool carrier,

a plurality of tool slides mounted on said carrier, feed screws for eachof said slides, said feed screws being at the same distance from theaxis of said carrier, each of said feed screws having a star wheel, oneof said wheels being of larger diameter arid farther from thehereinafter mentioned stop support than the other of said wheels, astop-support, and stops, there being two sets of stops for each of saidstar wheels, the stops of the smaller star wheel not extending to theplane of travel of the larger wheel and being closer to the path of saidscrews than the stops for the other of said star wheels.

6. In a machine for turning crank pins, the combination of a rotatabletool carrier, a plurality of tool slides mounted on said carrier, a feedscrew for each of said tool slides, said feed screws being at the samedistance from the axis of the carrier, each of said feed screws having astar wheel, one of said wheels being of larger diameter and farther fromthe hereinafter mentioned stop support than the other, a stop supporttwo sets of stops for each of said star wheels, the stops of the smallerwheel being closer ,to the path of said screw than the stops of thelarger wheel, the stops of the sets of each wheel being staggered.

7 In a machine for turning crank pins, the combination of a frameadapted to fit over a projecting crank pin, a rotatable tool carriermounted within said frame, guides on said carrier parallel to its axis,a slide mounted on said guides, and a center in said slide.

8. In a machine for turning crank pins, the combination of a frameadapted to fit over a projecting crank pin, a rotatable tool carriermounted within said frame, guides on said carrier parallel to its axis,a slide mounted on said guides, and a center screw threaded in saidslide in the line of the axis of said carrier.

9. In a machine for turning crank pins, the combination of a frameadapted to fit over a projecting crank pin, a rotatable tool carriermounted within said frame, a slide for supporting a dead center, andmeans whereby said slide may be adjusted toward and from the end of thecrank pin over which said frame may be fitted.

In testimony that I claim the foregoing, I have hereunto set my hand.

JOHN PURCELL.

Witnesses:

H. LARIMER, DAVID H. OWEN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

